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Investing Receivables - Investing Receivables (Details) - Investing Receivables - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 89,958	$ 87,415
Allowance for credit losses	(3,250)	(2,794)	$ (1,645)	$ (1,599)
Investing receivables, net	86,708	84,621
Notes receivable from the City of Huntsville
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	72,544	69,703
Other investing loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 17,414	$ 17,712

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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